Foldable MiFi Sensor Monitors Vital Signs in Rats — SkimNews
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- MiFi, a foldable bioelectronic sensor developed at Imperial College London, compresses for insertion through a tiny incision and unfolds beneath the skin into a 2.1 cm square just 0.3 mm thick.
- In rat experiments, the implant continuously tracked heart rate, breathing rate, and body temperature with greater stability than wearable skin sensors — which 'intermittently faltered and produce non-realistic values,' per researcher Selin Olenik.
- The sensor runs on wireless near-field communication (the same technology as contactless payments), with an accelerometer detecting chest movements, per team member Fırat Güder.
- MiFi accesses interstitial fluid around cells, potentially enabling real-time monitoring of metabolites, enzymes, drugs, and antibiotics that sweat-based sensors can't reliably detect.
- Rats carried the implant for only about an hour with 'minimal' inflammation; longer-term animal studies come next before any human trials, Olenik said.
- Ravinder Dahiya of Northeastern University called the folding and integration 'the novelty' but flagged that long-term safety in people still needs verification.
- The implant likely wouldn't need to be scaled up for humans because device size depends on its capabilities, not the subject's body size, per Olenik.
Why it matters: Patients on long-term drug regimens could eventually gain continuous monitoring of chemical biomarkers — metabolites, antibiotics, drug levels — that sweat-based wearables can't reliably read, while also getting stable heart and breathing data, per the source. But the implant was validated in rats for roughly one hour; the next milestone is longer-duration animal work before any human use, Olenik said.
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